Depends. If the party differs only on economic policy from more liberal ones, but becomes more inclusive and tolerant; they could increase their chances. They won't be getting my vote, regardless, but that's be a much better GOP than what currently exists.
But why would they? Trump has "taken" them in a direction that causes even more people than ever before to pay attention to politics, whether in disgust or in cynical satisfaction.
But as far as I'm concerned, Trump is the mythical Republican who was able to say what they've always wanted to hear and do what they otherwise never could.